Rename the term serde to codec

[masih]

Rename to a more familiar term for better human readability.

[github-actions]

Suggested version: v0.5.0
Comparing to: v0.4.0 (diff)

Changes in go.mod file(s):

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gorelease says:

# github.com/filecoin-project/go-indexer-core
## incompatible changes
BinaryValueSerde: removed
ErrSerdeOverflow: removed
JsonValueSerde: removed
ValueSerde: removed
## compatible changes
BinaryValueCodec: added
ErrCodecOverflow: added
JsonValueCodec: added
ValueCodec: added

# github.com/filecoin-project/go-indexer-core/store/pogreb
## incompatible changes
New: changed from func(string, github.com/filecoin-project/go-indexer-core.ValueSerde) (github.com/filecoin-project/go-indexer-core.Interface, error) to func(string, github.com/filecoin-project/go-indexer-core.ValueCodec) (github.com/filecoin-project/go-indexer-core.Interface, error)

# github.com/filecoin-project/go-indexer-core/store/storethehash
## incompatible changes
New: changed from func(context.Context, string, github.com/filecoin-project/go-indexer-core.ValueSerde, ...github.com/ipld/go-storethehash/store.Option) (github.com/filecoin-project/go-indexer-core.Interface, error) to func(context.Context, string, github.com/filecoin-project/go-indexer-core.ValueCodec, ...github.com/ipld/go-storethehash/store.Option) (github.com/filecoin-project/go-indexer-core.Interface, error)

# summary
Suggested version: v0.5.0

gocompat says:

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